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Current balancing circuit

a current balancing circuit and current balancing technology, applied in the direction of electric lighting, light sources, lighting and heating apparatus, etc., can solve the problems of shortening the length of respective leds, affecting the electronic device, and complicating the circuitry

Active Publication Date: 2014-04-08
DELTA ELECTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a circuit that helps balance the current of multiple LEDs that are emitting light. The technical effect of this invention is that it ensures consistent and efficient lighting across the LED assemblies, resulting in improved performance and reliability.

Problems solved by technology

If the currents flowing through the LED assemblies are not balanced, the luminance will not be uniform and the longevity of respective LED will be shortened.
This would further impair the electronic device.
However, such independent driver will complicate the circuitry and increase the manufacturing cost.
More disadvantageously, the current balancing effect is bad as the driver has tolerance.
Nonetheless, using a plurality of common chokes will increase the number of magnetic elements in the circuitry, and thus the manufacturing cost is elevated and the size of the circuitry is expanded.
More disadvantageously, the current balancing effect is also bad as the common choke will induce a magnetizing current.

Method used

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Embodiment Construction

[0014]Several exemplary embodiments embodying the features and advantages of the invention will be expounded in following paragraphs of descriptions. It is to be realized that the present invention is allowed to have various modification in different respects, all of which are without departing from the scope of the present invention, and the description herein and the drawings are to be taken as illustrative in nature, but not to be taken as a confinement for the invention.

[0015]Referring to FIGS. 1 and 2, in which FIG. 1 illustrates the circuit block diagram of the current balancing circuit according to a preferred embodiment of the invention, and FIG. 2 illustrates the partial circuitry of the current balancing circuit of FIG. 1. As shown in FIGS. 1 and 2, a current balancing circuit 1 is applied to various illuminating devices, such as home illuminating devices, car illuminating devices, handheld illuminating devices, backlight source for LCD panels, traffic signal lights, and b...

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Abstract

The invention provides a current balancing circuit, which includes a plurality of light-emitting diode assemblies; an AC power generator for providing currents required by the light-emitting diode assemblies; and a plurality of current-equaling elements connected to the AC power generator, each of which is connected to a common mode connecting two light-emitting diode assemblies for balancing currents of the light-emitting diode assemblies.

Description

FIELD OF THE INVENTION[0001]The invention relates to a current balancing circuit, and more particularly to a current balancing circuit for balancing currents flowing through a plurality of light-emitting diode (LED) assemblies.BACKGROUND OF THE INVENTION[0002]Recently, with the breakthrough advancement of the manufacturing technique of light-emitting diodes (LEDs), the luminance and efficiency of the light-emitting diodes are greatly improved. The LED has replaced old fluorescent lamps as the illuminating device of the next generation. Nowadays, the LED has been widely employed in the applications of home illuminating appliances, car illuminating devices, handheld illuminating devices, the backlight source of LCD panels, traffic signal indicators, and billboards. In order to increase the luminance of the LED, a number of LEDs are connected in series to form a LED assembly.[0003]LEDs are generally DC loads. In the application where a number of parallel-connected LED assemblies are em...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B41/16
CPCH05B33/0821H05B33/0809H05B45/382H05B45/39H05B45/42
Inventor XU, LIZHIZHANG, WEIQIANGYING, JIANPING
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD